Johnston (lower body) will not participate in Saturday's training camp practice, Alex Insdorf of BoltBeat.com reports.
Johnston sustained a lower-body injury during Tuesday's joint practice against the 49ers, which prevented him from playing in Thursday's preseason game against San Francisco. The fourth-year wideout is not expected to miss much time while recovering from his injury, but the Chargers could take the cautious route and hold Johnston out of Thursday's preseason finale against the Rams.